Well, to be fair Petrov, Webber, Alguearsuari and buemi set their fastest laps after their 2nd pitstop – on fresh rubber.
We should take this into account while looking into fastest lap times.
It looks like Kubica was the fastest on the used tires.

Good point about Kubica, seems like Renault has the same problem as Ferrari – poor pace in qualifying but great during the race.
In case of Mercedes the is the opposite situation, they are quite fast in quali but usually create ‘train’ during the race.